The Daily Kos poll surveyed voters from May 17 to 19. PPIC surveyed voters from May 9 to 16.

Two weeks ago, Steve Poizner's campaign was touting a SurveyUSA poll showing that the race between Poizner and Whitman was a statistical dead heat. But the latest poll has some not-so-good news for the Poizner campaign. The latest from SurveyUSA shows Whitman reopening her lead to 27 points with a 54%-27% advantage over Poizner -- a wild swing of 25 points in less than two weeks that has raised suspicion among other pollsters.

But SurveyUSA's methods vary slightly from some other well-established polls. Unlike other polls, SurveyUSA exclusively uses automated calls, known as "robocalls" to contact voters. Those call lists, by law, must exclude cellphone users because federal law prohibits unsolicited robocalls to cellphones. The poll also uses a random-digit dialing method and identifies likely voters based on the response of those being surveyed. Other polls, such as the Field Poll, use voter file information to determine likely voters.

Field Poll director Mark DiCamillo said there would be another Field Poll released before election day but did not say exactly when. The joint USC/Los Angeles Times poll will also release a survey before the June 8 election